remove cross-publishing in build

Author: bjornregnell

build.sbt

@@ -1,8 +1,8 @@
 lazy val Version = "1.2.0"
 lazy val Name    = "introprog"
-lazy val scala213 = "2.13.6"
+//lazy val scala213 = "2.13.6"
 lazy val scala3  = "3.0.1" 
-lazy val supportedScalaVersions = List(scala213, scala3)
+//lazy val supportedScalaVersions = List(scala213, scala3)
 
 // to avoid strange warnings, these lines with excludeLintKeys are needed:
   Global / excludeLintKeys += ThisBuild / Compile / console / fork
@@ -14,7 +14,7 @@ lazy val introprog = (project in file("."))
     name := Name,
     version := Version,
     scalaVersion := scala3,
-    crossScalaVersions := supportedScalaVersions,
+    //crossScalaVersions := supportedScalaVersions,
   )
 
 ThisBuild / Compile / console / fork := true